Hi, there is no automatic threshold and segmentation that i know about, though you could use a script like this one to get a fast result, but you might have better results doing it manually,
try cropping your volume (crop volume module) with a spacing scale of 0.6x before starting your segmentation, then use the module “Gradient anisotropic diffusion” to filter some of the noise.
after applying your threshold do all the manual finishing you can before using smoothing (and use the smallest kernel size to keep detail).
As for the facet joints it’s almost impossible to get them separated automatically because they are not well visible on the CT slices, they need manual deletion of a vertebra then the use of boolean operations to keep the other (or to use masking operations to draw individual vertebras from the original segment), you might want to check this post for the separation part.
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